1

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FN6570.0

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ISL97636

8-Channel LED Driver

The ISL97636 is an integrated power LED driver that

controls 8 channels of LED current for LCD backlight

applications. The ISL97636 is capable of driving typically 72

(8x9) pieces of 3.5V/30mA or 80 (8x10) pieces of

3.2V/20mA LEDs. The ISL97636’s contains 8 channels of

voltage controlled current sources with typical currents

matching of ±1%, which compensate for the non-uniformity

effect of forward voltages variance in the LED stacks. To

minimize the voltage headroom and power loss in the typical

multi-strings operation, the ISL97636 features a dynamic

headroom control that monitors the highest LED forward

voltage string and uses its feedback signal for output

regulation.

The LED brightness can be pulse width modulated with an

applied PWM signal from DC to audio noise free 20kHz.

The ISL97636 features extensive protection functions that

include string open and short circuit detections, OVP, OTP,

thermal shutdown and an optional input overcurrent

protection with master fault disconnect switch.

Available in the 24 Ld 4mmx4mm QFN, the ISL97636

operates from -40°C to +85°C with input voltage ranges from

6V to 24V for high LEDs count applications.

Features

• 8 Channels

• 6V to 24V Input

• 34.5V Output Max

• Drive Maximally 72 (3.5V/30mA each) or 80 (3.2V/20mA

each) LEDs

• Current Matching ±1% Typ

• Dynamic Headroom Control

• PWM Signal up to 20kHz Dimming

• Protections

- String Open Circuit Detection

- String Short Circuit Detection with Selectable Thresholds

- Over-Temperature Protection

- Overvoltage Protection

- Optional Input Overcurrent Protection w/Disconnect SW

• 1.2MHz Switching Frequency

• 24 Ld 4mmx4mm QFN Package

• Pb-Free (RoHS compliant)

Applications

• Notebook Displays LED Backlighting

• LCD Monitor LED Backlighting

• Automotive Displays LED Backlighting

• Automotive or Traffic Lighting

Ordering Information

PART

NUMBER

(Note)

PART

MARKING

PACKAGE

(Pb-Free)

PKG.

DWG. #

ISL97636IRZ*

976 36IRZ

24 Ld 4x4 QFN

L24.4x4D

*Add “-T” or “-TK” suffix for tape and reel. Please refer to TB347 for

details on reel specifications

NOTE: These Intersil Pb-free plastic packaged products employ

special Pb-free material sets; molding compounds/die attach

materials and 100% matte tin plate PLUS ANNEAL - e3 termination

finish, which is RoHS compliant and compatible with both SnPb and

Pb-free soldering operations. Intersil Pb-free products are MSL

classified at Pb-free peak reflow temperatures that meet or exceed

the Pb-free requirements of IPC/JEDEC J STD-020.

Data Sheet

May 9, 2008